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  2. MD5 - Wikipedia

    en.wikipedia.org/wiki/MD5

    The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4, [3] and was specified in 1992 as RFC 1321. MD5 can be used as a checksum to verify data integrity against unintentional corruption.

  3. Polybius square - Wikipedia

    en.wikipedia.org/wiki/Polybius_square

    The Greek letters of a Polybius square. The Polybius square, also known as the Polybius checkerboard, is a device invented by the ancient Greeks Cleoxenus and Democleitus, and made famous by the historian and scholar Polybius. [1]

  4. Net smelter return - Wikipedia

    en.wikipedia.org/wiki/Net_smelter_return

    Net Smelter Return (NSR) is the net revenue that the owner of a mining property receives from the sale of the mine's metal/non metal products less transportation and refining costs. As a royalty it refers to the fraction of net smelter return that a mine operator is obligated to pay the owner of the royalty agreement.

  5. Net (economics) - Wikipedia

    en.wikipedia.org/wiki/Net_(economics)

    A net (sometimes written nett) value is the resultant amount after accounting for the sum or difference of two or more variables. In economics , it is frequently used to imply the remaining value after accounting for a specific, commonly understood deduction.